华 中 科 技 大 学 硕 士 学 位 论 文
Abstract
With the rapid development of artificial intelligence and networks, fiber optic sensors
have ushered in a period of rapid development. Wavelength demodulation-based fiber optic
sensors have the advantages of low cost and simple structure, However, demodulators and
micro-spectrometers currently used in laboratories for fiber optic sensing often need to
export data offline to a computer for processing, which makes it difficult to realize real-time
demodulation of spectral data. Based on the above problems, this paper designs a program
based on MATLAB software to call the collected spectral data in real time and constructs a
real-time demodulation interface through GUI to realize the real-time demodulation of fiber
optic sensors. The main research contents of this thesis can be summarized as the following
three points.
(1) The software design process of the real-time demodulation system is introduced.
The real-time demodulation interface based on MATLAB software is built to address the
shortcomings of the spectrometer or demodulator currently used in the laboratory, which is
difficult to achieve real-time monitoring. Firstly, the real-time data acquisition and recall are
realized, and then the real-time display and monitoring of spectral data are realized
according to the graphical user interface (GUI). Finally, the real-time demodulation system is
designed according to the different sensors monitored to realize the real-time demodulation
of fiber optic sensors.
(2) Design a real-time demodulation system based on the fiber optic sensor with
simultaneous AC/DC measurements. To address the problem that the grating demodulator
currently used in the laboratory can only achieve simple temperature and stress
demodulation, through the serial port grating demodulator data into the computer in real time,
the use of MATLAB data processing to achieve complex grating demodulation. A current
sensor combining fiber Bragg grating (FBG) and giant magnetostrictive materials (GMMs)
is designed to achieve simultaneous AC and DC measurements. The principle that this fiber
optic sensor can achieve simultaneous AC and DC measurements is analyzed, and then the
ability of the sensor to measure AC and DC simultaneously is verified in experiments.
Finally, real-time demodulation of the spectral data is achieved by importing the data into the
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